Nouns denoting natural phenomena

turbulent flow
flow in which the velocity at any point varies erratically
 
AC
an electric current that reverses direction sinusoidally
 
thermionic current
an electric current produced between two electrodes as a result of electrons emitted by thermionic emission
 
interference fringe
one of the light or dark bands produced by the interference and diffraction of light
 
equinoctial storm
a violent rainstorm near the time of an equinox
 
skin effect
the tendency of high-frequency alternating current to distribute near the surface of a conductor
 
whiteout
an arctic atmospheric condition with clouds over snow produce a uniform whiteness and objects are difficult to see; occurs when the light reflected off the snow equals the light coming through the clouds
 
El Nino southern oscillation
a more intense El Nino that occurs every few years when the welling up of cold nutrient-rich water does not occur; kills plankton and fish and affects weather patterns
 
harmattan
a dusty wind from the Sahara that blows toward the western coast of Africa during the winter
 
sound spectrum
the distribution of energy as a function of frequency for a particular sound source
 
impulsion
a force that moves something along
 
moment of a couple
given two equal and opposite forces, the product of the force and the distance between them
 
wave
a persistent and widespread unusual weather condition (especially of unusual temperatures)
 
cloud
any collection of particles (e.g., smoke or dust) or gases that is visible
 
resonance
an excited state of a stable particle causing a sharp maximum in the probability of absorption of electromagnetic radiation
 
virtual image
a reflected optical image (as seen in a plane mirror)
 
tramontana
a cold dry wind that blows south out of the mountains into Italy and the western Mediterranean
 
scorcher
an extremely hot day
 
self-induction
generation of an electromotive force (EMF) in a circuit by changing the current in that circuit; usually measured in henries
 
arterial pressure
the pressure of the circulating blood on the arteries
 
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